my furnace does not blow hot air. And the red light indicator stays on continues. My furenace is westinghouse it is 4 years old. And the furnace keeps on working even when I turned off from the in the termostat. I can only turn it off by unplaging the power cord. The wiring diagram in the furnace says 1flash =Limit circuit opens or external load on "W". And I don't know what is the problem or if it can be fix? Can anybody help me with that problem. Thank you for the help.

One of two things you have a open limit switch or a short in the W circuit. Your roll out limits and vent limit switch will have a button in the center. You have to manually push it to reset it.(small disk above the burners and around the furnace vent inside the unit two wires will go to each one)

Had one yesterday with the same thing. It one of the limit switches. This one was the blower limit switch